jeudi 1 septembre 2016 06:28
Sorry about the misinformation on the weekly outage. When we're in outage mode the message uses the current day of the week as the day of the weekly outage. We will go back to Tuesday outage next week.
The delay in the outage this week was due to the media flap over the Russian announcement.
|Breakthrough Listen observations of HD 164595|
mardi 30 août 2016 21:37
The Breakthrough Listen team has posted their archival search for emission from HD 164595 and the initial analysis of their recent observations of that target.
|New beta application|
mardi 30 août 2016 12:52
Hi Crunchers, The eagle-eyed amongst you might have noticed the recent appearance of "Python Runtime" as the latest addition to our stable of applications. * what is it? This app deploys a Python runtime environment based on the Conda python distribution. * why do we need it? Almost all of our application development is now done in Python. This app will give us a way to reliably deploy and execute our software on GPUGRID volunteers' computers by providing a uniform, known Python environment * how will it be used? If all works well, we'll be able to quickly test and deploy whole new applications, including replacements for the quantum chemistry and CPU MD applications we have previously experimented with. Being able to rapidly deploy new applications will markedly improve the rate at which our research group can innovate. For the moment the app is Linux only but we hope to roll it out to Windows once it proves reliable. Matt
|"Baffling" "signal" "from HD 164595" is probably none of the above.|
lundi 29 août 2016 19:50
I'm sure that many of you have seen the news reports of a "SETI signal" detected from the star HD 164595
I was one of the many people who received the the email with the subject "Candidate SETI SIGNAL DETECTED by Russians from star HD 164595 by virtue of RATAN-600 radio telescope." Since the email did come from known SETI researchers, I looked over the presentation. I was unimpressed. In one out of 39 scans that passed over star showed a signal at about 4.5 times the mean noise power with a profile somewhat like the beam profile. Of course SETI@home has seen millions of potential signals with similar characteristics, but it takes more than that to make a good candidate. Multiple detections are a minimum criterion.
Because the receivers used were making broad band measurements, there's really nothing about this "signal" that would distinguish it from a natural radio transient (stellar flare, active galactic nucleus, microlensing of a background source, etc.) There's also nothing that could distinguish it from a satellite passing through the telescope field of view. All in all, it's relatively uninteresting from a SETI standpoint.
But, of course, it's been announced to the media. Reporters won't have the background to know it's not interesting. Because the media has it, and since this business runs on media, everyone will look at it. ATA is looking at it. I assume Breakthrough will look at it. Someone will look at it with Arecibo, and we'll be along for the ride. And I'll check the SETI@home database around that position. And we'll all find nothing. It's not our first time at this rodeo, so we know how it works.
|Meet a World Community Grid Team Member: Erika Tuttle|
Source: World Community Grid News and Updates
vendredi 26 août 2016 20:51
Website testing, financial tracking, legal coordination, forum management...Erika Tuttle has a hand in almost every aspect of World Community Grid's operations. Learn more about this second-generation IBMer in our latest employee article.
|Moving multicore out of beta on Mon 29th August|
vendredi 26 août 2016 13:27
We intend to move the multicore app out of beta on Monday the 29th August. This means that by default everyone will get both singlecore and multicore WU.
The main motivations for this are that multicore provides better CPU and memory efficiency, and we only have to manage a single stream of tasks instead of two.
If you do not want to run multicore you can disable it in your ATLAS@Home preferences in the option "Run only the selected applications"
By default the tasks will use as many cores as you have allocated to BOINC. For tuning the number of cores that the tasks will use you can create an app_config.xml file as described in this thread
At some point we plan to discontinue the singlecore app and run only multicore. The multicore app will also run on 1 core so you can still continue with ATLAS even with a single core.
The ATLAS@Home team
|Berkeley SETI Research Center Highlights|
jeudi 25 août 2016 21:09
We hope you enjoy this five minute highlight reel of some of our previous and upcoming videos. Hear about SETI@home and the Breakthrough Listen optical and radio searches, visit the Green Bank Telescope, see our computing hardware, and meet some of our undergraduate researchers: https://youtu.be/y0betLmOYhk
Follow Berkeley SETI on Twitter: http://twitter.com/setiathome
|The Attribution Question|
jeudi 25 août 2016 13:49
Whenever an extreme weather event happens that impacts society the “attribution question” whether human induced-induced climate change played a role is asked.
Scientists are now able to answer this question for many different types of extreme weather events. However, the answer depends on how the attribution question is framed. Different framings and differing definitions of the extreme event in question lead to different answers.
In a new commentary published in Nature Climate Change today CPDN researchers investigates how different studies pose the attribution question highlighting that it is paramount for every extreme event attribution study to clearly define the event and state the framing of the attribution question being asked
Watch CPDNs Fredi Otto explaining the paper.
Every extreme weather event has multiple causes and ultimately defined unique. The same impacts of the event that occurred however are usually not unique but can be caused by a certain type or class of extreme events, e.g. a summer heat wave of a certain temporal and spatial extend with temperatures above a critical threshold. If the purpose of an attribution study is thus to make planning decisions in disaster recovery the harm caused and not the exact state of the atmosphere are the defining characteristics.
Human induced climate change can alter the weather in different ways and there are two basic effects:
Firstly, with raising temperatures on a global average we expect more heat waves on average. Warmer air can also hold more water vapour so we expect more heave downpours.
However, the increased concentration of greenhouse gases in the atmosphere can also alter the atmospheric circulation. This is the second, so-called dynamic, effect. Locally changes in the circulation can counteract or increase the thermodynamic effects and thus for example decrease the risk of extreme rainfall in a particular region and season despite the globally observed increase.
Attribution studies rely on climate models which are necessarily imperfect in particular with respect to representing the atmospheric circulation. For that reason some scientists have suggested to only focus on the thermodynamic effect and ask the attribution question:
Given the state of the atmosphere at the time of the event how did the overall warming influence the event.
This is scientifically interesting and might answer a very specific stakeholder question but the answer to this question does not say anything about how likely the atmosphere is ever going to be in that state again. And thus what the overall risk of the event occurring is and how it changes. From the perspective of a stakeholder seeking information to inform disaster risk reduction strategies, it can however be unhelpful to ask the question in this conditional framing as it does not assess whether the event that has caused the harm was a case of bad luck and is unlikely to happen again or whether this type of event is what society needs to get used to.
|No unreserved Aliquot Sequence below size 131 anymore|
mercredi 24 août 2016 14:54
I reserved all unreserved Aliquot Sequences with size=130 for the project. There is now no unreserved sequence below 131 anymore. We increased many sequences in it's size and were also terminated some.
We got a little bit stuck on the very big numbers. Only 2 have 16 or more cores in their system and run the YAFU-16t application.
But currently there is also enough work to do for the standard YAFU app.
Much thanks for your contribution!
|Multi-core version 1.04 with support for VirtualBox 5.1, OS X and graphics|
mardi 23 août 2016 13:27
Version 1.04 of the multicore app has been released with the following improvements:
- support for VirtualBox 5.1
- support for OS X (finally!)
- graphics (same as single core app)
Thank you for your continued support of ATLAS!